RPC client applications can use Secure Sockets Layer/Transport Layer Security (SSL/TLS) as the transport medium. The term "SSL" in this document refers to both SSL and TLS. RPC-based clients are always SSL clients. The SSL server can be either the EntireX Broker, Broker SSL Agent, or Direct RPC in webMethods Integration Server (IS inbound). For an introduction see SSL/TLS, HTTP(S), and Certificates with EntireX in the platform-independent Administration documentation. This document describes using SSL with the COBOL Wrapper on the following platforms:

• z/OS

• z/VSE

• UNIX, Windows, BS2000

---

z/OS

SSL delivered on a z/OS mainframe will typically use the Resource Access Control Facility (RACF) as the certificate authority (CA). Certificates managed by RACF can only be accessed through the RACF keyring container. A keyring is a collection of certificates that identify a networking trust relationship (also called a trust policy). In an SSL client/server network environment, entities identify themselves using digital certificates called through a keyring. Server applications on z/OS that wish to establish network connections to other entities can use keyrings and their certificate contents to determine the trustworthiness of the client or peer entity. Note that certificates can belong to more than one keyring, and you can assign different users to the same keyring. Because of the way RACF internally references certificates, they must be uniquely identifiable by owner and label, and also unique by serial number plus data set name (DSN).

For establishing an SSL connection on z/OS, IBM's Application Transparent Transport Layer Security (AT-TLS) can be used, where the establishment of the SSL connection is pushed down the stack into the TCP layer.

With the COBOL Wrapper you can use IBM's Application Transparent Transport Layer Security (AT-TLS), where the establishment of the SSL connection is pushed down the stack into the TCP layer.

Using IBM's Application Transparent Transport Layer Security (AT-TLS)

Configure the AT-TLS rules for the policy agent (PAGENT) using an appropriate client and the z/OS Management Facility (z/OSMF) . Together with SSL parameters (to provide certificates stored in z/OS as RACF keyrings) define AT-TLS rules, for example by using the application job name and remote TCP port number. If the rules match, the TCP connection is turned into an SSL connection . Refer to your IBM documentation for more information, for example the IBM Redbook Communications Server for z/OS VxRy TCP/IP Implementation Volume 4: Security and Policy-Based Networking.

	Client to interact with z/OS Management Facility (z/OSMF).
	AT-TLS rules are defined with z/OSMF policy management.
	Policy Repository with AT-TLS rules stored as z/OS files.
	Policy Agent, MVS task PAGENT, provides AT-TLS rules through a policy enforcement point (PEP) to TCP/IP stack.
	Application using TCP connection.
	If AT-TLS rules match, the TCP connection is turned into an SSL connection.

Notes:

1. The client may vary per operating system, for example a Web browser for z/OS 2.1.
2. z/OSMF includes other administration and management tasks in addition to policy management.
3. Policy Management includes other rules, such as IP filtering, network address translation etc.

To set up SSL with AT-TLS

1. To operate with SSL, certificates need to be provided and maintained. Depending on the platform, Software AG provides default certificates, but we strongly recommend that you create your own. See SSL/TLS Sample Certificates Delivered with EntireX in the EntireX Security documentation.

2. Set up the RPC component for a TCP/IP connection. On mainframe platforms, use Transport-method-style Broker ID. Example:

   ETB024:1699:TCP

3. Configure AT-TLS to turn the TCP/IP connection to an SSL connection, using a client to interact with the z/OS Management Facility (z/OSMF). The outcome of this configuration is a Policy Repository with AT-TLS rules stored as z/OS files. This file is the configuration file for the Policy Agent, MVS task PAGENT.

4. Make sure the SSL server to which the RPC component connects is prepared for SSL connections as well. The SSL server can be EntireX Broker, Broker SSL Agent, or Direct RPC in webMethods Integration Server (IS inbound). See:

   • Running Broker with SSL/TLS Transport under z/OS | UNIX | Windows

   • Broker SSL Agent (UNIX | Windows)

   • Support for SSL/TLS in the EntireX Adapter documentation (for Direct RPC)

z/VSE

Establishing an SSL connection on z/VSE requires BSI's Automatic Transport Layer Security (ATLS). This facility is similar to z/OS Application Transparent - Transport Layer Security (AT-TLS). ATLS is supported by the BSI stack only.

Using BSI's Automatic Transport Layer Security (ATLS)

Together with SSL parameters (to provide certificates), define ATLS rules for socket interception in the ATLS daemon startup job BSTTATLS . If the rules match, the socket connection is turned into an SSL connection . Refer to your IBM documentation for further information. For an overview, refer to the IBM Redbook Enhanced Networking on IBM z/VSE; for a more detailed description, refer to BSI SSL Installation, Programming and User's Guide.

	BSI TCP/IP Stack, either BSTTINET (IPv4) or BSTT6NET (IPv6).
	ATLS rules are defined manually. See Sample ATLS Daemon Configuration below.
	BSTTATLS is associated with a TCP/IP stack.
	Application using TCP connection.
	BSTTATLS intercepts outbound TCP connection and converts it to SSL connection. For inbound, SSL connections can also be intercepted and converted to TCP connections.

To set up SSL with ATLS

1. To operate with SSL, certificates need to be provided and maintained. Depending on the platform, Software AG provides default certificates, but we strongly recommend that you create your own. See SSL/TLS Sample Certificates Delivered with EntireX in the EntireX Security documentation.

2. Set up the RPC component for a TCP/IP connection. On mainframe platforms, use Transport-method-style Broker ID. Example:

   ETB024:1699:TCP

3. Configure ATLS to turn the TCP/IP connection to an SSL connection, see above.

4. Make sure the SSL server to which the RPC component connects is prepared for SSL connections as well. The SSL server can be EntireX Broker, Broker SSL Agent, or Direct RPC in webMethods Integration Server (IS inbound). See:

   • Running Broker with SSL/TLS Transport under z/OS | UNIX | Windows

   • Broker SSL Agent (UNIX | Windows)

   • Support for SSL/TLS in the EntireX Adapter documentation (for Direct RPC)

Sample ATLS Daemon Configuration

* Converting inbound EntireX Broker connection 
* Converts listen port 1971 to SSL listen port 1972
OPTION SERVER 
ATTLS 1971 AS 2071 SSL
*
* Converting outbound client connection
* Converts connect to 192.168.2.100:1972:TCP to 192.168.2.100:2072:SSL
OPTION CLIENT
ATTLS 1972 TO 192.168.2.100 AS 2072 SSL

// SETPARM SUBTASK=8

See also BSI SSL Installation, Programming and User's Guide.

UNIX, Windows, BS2000

RPC client applications built with the COBOL Wrapper do not support Secure Sockets Layer/Transport Layer Security (SSL/TLS) as the transport medium under UNIX, Windows or BS2000.